66457641667 has 2 divisors, whose sum is σ = 66457641668. Its totient is φ = 66457641666.

The previous prime is 66457641643. The next prime is 66457641673. The reversal of 66457641667 is 76614675466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66457641667 - 2⁷ = 66457641539 is a prime.

It is not a weakly prime, because it can be changed into another prime (66457641637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228820833 + 33228820834.

It is an arithmetic number, because the mean of its divisors is an integer number (33228820834).

Almost surely, 2^66457641667 is an apocalyptic number.

66457641667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66457641667 is an equidigital number, since it uses as much as digits as its factorization.

66457641667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 58.

The spelling of 66457641667 in words is "sixty-six billion, four hundred fifty-seven million, six hundred forty-one thousand, six hundred sixty-seven".